<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">
	
this.c = 5;
function a(x,y,z){
	arguments[0] = 5;
	alert(this+x-y*z);
	/*
	'51' + 5 - 2 * '3';
	'51' + 5 - 6
	'515' - 6
	509
	*/
	//5156
	//509
};

a.apply((function(b){
	return b+'1'
})(this.c),[10,2,'3']);

</script>
</body>
</html>